Allegretti, Stefania, Iulia Martina Bulai, Roberto Marino, Margherita Anna Menandro, and Katia Parisi. “Vaccination Effect Conjoint to Fraction of Avoided Contacts for a Sars-Cov-2 Mathematical Model”. Mathematical Modelling and Numerical Simulation with Applications 1, no. 2 (November 26, 2021): 56–66. Accessed July 1, 2022. http://mmnsa.org/index.php/mmnsa/article/view/10.